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安师联盟 安徽省2024年中考仿真极品试卷(三)3物理试卷答案试卷答案

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安师联盟 安徽省2024年中考仿真极品试卷(三)3物理试卷答案第一部分

2.如图,两个完全相同质量均为m的橡皮擦a、b(可视为质点)放在水平圆盘上,a与竖直转轴0O(图中点未画出)的距离为l,b与竖直转轴的距离为1.5l,橡皮擦与圆盘的最大静摩擦力为橡皮擦所受重力的k倍,重力加速度大小为若圆盘从静止开始绕轴缓慢地加速转动,用ω表示圆盘转动的角速度,下列说法中正确的是()VkmyA.a、b所受摩擦力大小始终相等3.一定比b先开始滑动pnw2k3&4kmC.当=3kg4l时a所受摩擦力的大小为knk)&4D.=2kg3l是是b开始滑动的临界角速度

安师联盟 安徽省2024年中考仿真极品试卷(三)3物理试卷答案第二部分（待更新）

(3)该同学了解热敏电阻的特性后,设计了如图丙所示的报警电路:电源电动势为30V,内阻可忽略,电阻箱Rx的最大阻值为5kΩ,,电路中的电流达到4mA时,报警装置开启当电阻箱Rx的阻值调为0,环境温度达到80^C时电路中的电流为6mA,则保护电阻R0的阻值为,若要报警装置在环境温度为50^C时开启,电阻箱R2的阻值应该设为若要报警装置开启的温度降低,则电阻箱Rx的阻值应(填“增大”“不变”或“减小”)。